Lift points on a '83 Scarab 377

I'm new to the forum...thanks in advance for any responses. I'm building a dock with lift and the dock builder has requested lift points for my '83 Scarab 377. I bought the boat a couple years ago and have been able to find the original owner's manual, but it doesn't have any info on the subject. A quick search on the internet wasn't very helpful either. My dock builder has an idea of where he would put them if we can't find some guidelines...thanks again!